That was dark
I love it!!!!
Also you get an upvote

And im watching you
I mean following you

A while ago you asked if someone could read over your story and give you a few pointers of why you might be receiving so many down votes, even after you edited the story. I've been writing stories for close to twelve years now and telling stories for longer, so allow me to offer my observations.

First off, I must admit that I only made it about 1600 words into the story, basically to the point where poor little Flutters decided that she was going to do something to Big Mac. Why I stopped there? The story didn't pull me in. In the beginning there wasn't any hook that made me want to read on. I think that it had to do with the lack of descriptions. Descriptions, funny enough, can really transform a story, give it atmosphere and even bring things and objects, i.e. the picnic basket, sun, the forest trees or the wind, to life and even make them into a background character that makes this world your talking about alive and vibrant. With the lack of descriptions, your story was just, well, words. Words on a screen.

As I said before, I only made it to the point where Fluttershy woke up with a plan, which might I add does seem rather fast for a pony like Fluttershy to decided on such a vengeful act, so I can't speak for the rest of the story, but that's what killed it for me. I won't down vote, you have enough of those as is, but I think more work can improve this story, or you can completely rewrite it, and put it under a new name (change a few things mind you, so it really is a slight different story) so people can give it a fresh, unbiased look.

Those are my opinions on the subject anyway. Hope it helps, and best of luck writing.

As someone pointed out, your story really lacks details.Use details to let the story flow.So allow me to criticize the story:
-Fluttershy's relationship with Big Mac came out of nowhere.So was the cheating and their conversation
-Fluttershy's plan was so...eh.I mean, her justification is very lame